Tesis.event.onDOMReady(function() {
    var layout = new YAHOO.widget.Layout({
        units: [
        {
            position: 'top', 
            body: 'layout-top', 
            height: 115
        },
        {
            position: 'center', 
            body: 'layout-center',
            gutter: '0px 0px 0px 0px',
            scroll: true
        },
        {
            position: 'left',
            body: 'layout-left',
            width: 300,
            resize: false,
            /*gutter: '4px',*/
            collapse: true,
            scroll: true,
            animate: true,
            header: 'OPCIONES'
        }
        ]
    });
    layout.render();
});